63
(63 pounds 9 oz) - (21 pounds 11 oz) = 41 pounds 14 ounces.
It is: 63-4 = 59
if you mean (3/(2x-5))(21/(8x2-14x-15)) you would get (63/( (2x-5)(4x+3)(2x-5) ) simplified more would be 63/ ( (2x-5)2(4x+3) )
84
91 - 63 = 28
63 - 10 = 53
100 - 63 = 37
63 - 37 = 26
45 - 63 = -18
-16 - 63 = -79
63 - 18 = 45